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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fad1f862e8ba7cd9290a2ca2819b01c9caf1634f084a38c6636326bba38599c' 
  AND token = 'oIUFwNNOcgNh70czkWSAEodEeztFR8P5JWAGCs69rB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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