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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1fafdf0fb8a945b852f3e06d011887d70f8623f9b146955d493b47d89118c4d3' 
  AND token = 'RvAR16kptDDKhOmxaEOQGGR48Npxvir3ve4iOVD22HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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