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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae0caaf6593096d736656e6ae54eaf4537289e799653550777edace71e489ba2' 
  AND token = 'rvZ0qnnas6FaU3+1JNvu6sFJYHRu285Z0xJrTtAATqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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