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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ba7fcbae5a78542720ad5e01b465df9a2924364daa3e1d1569b08ae5c980fcfe' 
  AND token = 'v/S5FQviiyXuliNpK4HNjOhIJ0WDuLv6NYh5428MKQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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