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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9e50ac5f8870add1a3f1c6c44ec1fdb06ebc534028159b5a1a93e04eaaf266a' 
  AND token = '5n/AI2nFMR1r5dLGUAnBBklN2eBHKv4I/yTau7I6rW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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