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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1614bf6e03dd8733df81a42c3d05128ce3d12110d7d7db49dc0b3543ffb3f6b9' 
  AND token = '9njHq66tkXJiUS3IoISawkwqp6Jj/IzTbC2hCGJoS4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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