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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '863c64f4da668775fa08e7d0d5407aa30bf066fda998a012dcb34f1af1a977d8' 
  AND token = 'W+3SYf/sXNJJE4Mfj7aWPUv+Ecjq7fEEUoLHhwDaSo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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