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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e2a56e836d7dc6f3aad3e87e4ed5ce861460092e6217d17384c36e697b02948d' 
  AND token = 'CYFMf4DebVRACoUxMOQAI/JaVNxMmsfzAccI0b1pkGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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