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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba8028632e7613437bff1b13a530bdbb3c72d1c40f1baee121f24cfde61d4804' 
  AND token = 'R3dCp79wVXDfAuYes+WLMsthYOQN77Y86joJCweB7UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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