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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13ef33466b4ec62a2aa6f4b83080cbc83aeb9dcda6fef3e942773b9834845574' 
  AND token = 'K9dVzdsKq8Fm5awueMBRv0aPk2/Hno5rX2cobGtdQjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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