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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '022e310eb9e126beda67554967fe62c67b30f8888a40dd2ef45e4219c2dbe584' 
  AND token = 'l78/pEM1x/mnmzSFoLrYu82ALsE1VZeOpupPpZFuUeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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