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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11cfde2767ba13acdce386fdf2080211c62571c916387057ef7ec08db7523a3a' 
  AND token = '0rkBnkpG6P1+TWUsqH3MHkMWmMzhVTQDAAxkRlYy6hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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