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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5d4c187929ebb7ee4c301b454fe93ab1cd3546735203079b2401ae4225e47c62' 
  AND token = 'zlCl7As7Mk7B1DDyOby1HLiCJ/sxOnwPqTUhx4ecQjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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