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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b28c017d34c4399abd33c50066e79cf2f3e609a522859be4683afccb7a733a83' 
  AND token = 'WUzMfH7i34gKuqn8sh3dnYQq4tEfgvqfkjQ6x62sIG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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