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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '485a2bc8cfc4e7364d9b85fe623d1256e23cb7d43517d58ab74ae854ae773e82' 
  AND token = 'iyJM/8FbIqSqQQpdVqIixd39uSBr92hpvU939KUlX2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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