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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '927981bc1e93835c276d75d5db4504c6961a4cce69f9867444f24f2e5fdd3329' 
  AND token = 'zcIE4toKYVeoCjRJ1baKagIWYW7Yuilcgl8UaedTS7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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