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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2c875f324774cdd2b91ce755396f1aa07f7046894ded2d58f9d3c57fd060db2e' 
  AND token = 'OYPI8JLmMcooILvVd58R8MDB8fszonQMIFKdGMXtRDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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