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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ba40f9f70536a1c1c019ff7e3b300a7a56509962fc3bdaceb72301ad7f8ca4d' 
  AND token = 'K4jEcpTrj3UC9FFi6UfyqiHdpNui5Cx5O/wK0oSoeos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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