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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10842e781e9ce023a850b14173c6025c13b938f98c720ab9e79b8a18850561d9' 
  AND token = 'Im0l/62eZuxtv0mIUD3CkAZWfaHDr4SgDMAifJ8ROmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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