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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'afdeb044ba4ffb6e8011a65fa8059b18fc88413a0825fe162f3530b516aeb0a3' 
  AND token = 'u1HyDetNwBHw0lZ3OMHjX1pMF2YqvbuiiddaMnFZMv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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