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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe67f6e12e85f85c03edfaff2eaf0919da6dbab9272e8ec1f60d96bbf3712807' 
  AND token = 'EjZPkn4UkV9J1uZneYtMvCXghwbv/W1IogP41TDP0lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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