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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9ea06279a6fbd3b8e8a763404e11057e8519c3e2f6c972fdcb53a8d97a7429a' 
  AND token = 'gfdr1U7TX+LJ7Np8xtZi69fd/exnAGE5FX+i8/eMmbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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