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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b982ac4277e785df7f9783c57719b2b407272233d1bf8f6119a40a3696cc19e0' 
  AND token = '/rHgpEuJWr0Hs6vqGhxxL0aqrcT4UP6fEO1Ivf6kh4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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