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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f45914496382d48ca8a25679313d8135565860f89f4cd6d89a1666792bc5f0b9' 
  AND token = 'Qf16IUOZ4gNk596egmwJ4xOudwNSEnHvMr8h09OuMC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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