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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '778859bddec115a00ffc954e484dea4722ad7e547f8f8ca701c65fcc0857a39d' 
  AND token = 'N91StPV0+soO8lo9l45ByqJ5BN1N+YNJKHhD1FiM+3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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