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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1d6b0d9ac4ec50e2246eb318786f9198277c9208213eaa96d186de98a9e186a1' 
  AND token = 'KEh11YPj5u8A3SymA/dlxHejCyItbDeRCFfH07F/tkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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