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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5d06114f7dc7fd86ed5aa0f7609ac66e23ca6de191424b865f0a2287bf6a31f' 
  AND token = 'arEm1Nugp8+7RRbpC7oVVjr7CkLKM7HM15+qCCXRp4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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