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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b3ebb9cc3dd7db74f447c9fa3dfd7239be4c6d2686a4f6070f91369e25729dd7' 
  AND token = 'ebaDUw7+ztCwyOFffsAH7x8q4Q5g3psYVD8RkVkQGK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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