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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1820d47e7105cdf2f1ddec43a8dda55ea780c3a38e4c74218911ef670651ddd' 
  AND token = 'HArLMF4hGGPwOjWV5v8KljGb41S+Bew/kLthkWhjfiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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