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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '749d3cdbef9ee175f051615ca0ef38a5ca144f15968fefe267aa6e733541bf73' 
  AND token = 'MQfekxEb2nwmfWliyKyZy1uGiRXeuoIpAetQ8qVNWjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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