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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '316794a094bdd5dfa0041a49fa26a76663b7edbcd6ef90c33f4208ab91345613' 
  AND token = 'J2jub+iBitsb/SmPE/2hxlT66SBc6OtBwRpUaU+ouHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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