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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a0b7e27b64e8932448168e14bc2fb8acd1ea89eaa4365cf245a9f7b89c661f79' 
  AND token = 'QmmR7LGP1xrWeQhdoA0BApDI1tkdWJ4TSEdgCxEy+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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