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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70e2a678a23ce06e1c64d8f2099f1a4990f3d58276f8492d6482edaa77b62728' 
  AND token = 'EQnZFNB7JCuTWoeRavPZnJJBQtALSDNoEAHX+kej7UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}