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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa0a33e7b5cbd019ceeec85c3adc1f74d1aed4b0ed31acf6ea2174f401ff1b8b' 
  AND token = 'KtjFEqrtxQG2ywC41bNA036RKvrmxZFuwzWLLsg/Gqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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