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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e833ee022673c02828e8f65ce8d1dbfb79d66b21969eea9ad5552e8f623ba7ab' 
  AND token = 'XF6IKYM//LpMje3mxVaN+U9DzeUIIw7+cz/nZRw2pdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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