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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd27e5acf4ad9ea22fb7736a3ef80ac67b861e69dde2de2dd89984f35298cd004' 
  AND token = 'Rk4CFsK8i+LNMMjTC7JXYc6C8dG25VINWdBny/HKktA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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