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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc98f2b0438cfffdef9eb57ee0003a2a1f7408057194c3ff35aa1459fad3a819' 
  AND token = 'kuf5Wh8z0vxMNE44OGr4R+26s1ThF9EecbddBJPGlhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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