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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5aad84b2b4aa8ff04385d6745515be54767656f80e4c44a922b16c3bf5848ead' 
  AND token = 'iHVCIHQCW8FnocP/Ls/ls8Uef7C5XXVRgyIzVK/v5vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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