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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07a2f2d891a010c4b89c1e5bee945ce0838e7a03c3d68d0a02bd81c14f6f93c9' 
  AND token = 'OqxJvPFuLDub70floGx1+4l0N3VsB8gBV5FZt5HBqq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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