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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '677d7bc1fb5f64a77dd1dc9bad96ba83f56ca4f542949473520e717b3b949425' 
  AND token = 'UP2xHLB1RiHUlLJxu8Ei2NcL6tKQCHk/MTTWdDL5b2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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