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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '630da7f906a97c0a004132c2f5dfa28104619f01fe72a27d562bedddea0b36a4' 
  AND token = 'YF9PRCaU0kC1ZEsYP9n/2fzJv4DTPLWHhdy7h04BbDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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