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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce57ba0c0b0419cc11142cb4dcd822cbf4659a6aef5dca3683c9d00aeffcd976' 
  AND token = 'ILTM5GobqHIpnhX2jmMURD+xsHTe5dk+Ojl0nOIFYyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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