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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebaa8f4b1dfea1b31420c333b3fb6ad59c8d2e972495e0a72a6594dde1eea70e' 
  AND token = '3o+KWYlhNozXW4EMiEEmyEGb2pQr7Q5KvpS8GtV5MN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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