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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9000f267b002f370e454f7e9fdd87f1d39e0f0ac25cfdf2bc3b59704b202e8d0' 
  AND token = 'C88Zf3O9SLRQeMAo0Gl45xPxANrUpVVqqTyPcfQYDrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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