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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be984bb6a953c99e967919eac5b62fb54afaa14d5873b75a9d1324f9e00639c1' 
  AND token = 'xjs6GouRvPQxeeXW8t7vWqkxSWbidCGigKFt1gPzo4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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